Be warned that entering some of these cheats in the game will disable certain achievements/trophies, player should do so that their own risk. Accessing secrets is different from cheats, and will not affect the status of gameplay. There is no way to unblock the achievements except for re-loading the game without saving after the cheat has been activated. However, if a player uses any of these cheats, but still desires all the achievements, they can simply start a new game file and complete the first mission. Then there are no blocks on the achievements. Also, because of the way that cheats work, they may have undesired effects on gameplay, such as glitches.

Inputting cheats does not block the player from getting 100% completion, just achievements/trophies. Note that in the PS3 version of the game, reloading the game file will make the trophies available, provided the player does not use those cheats again during the new session.

Note that cheats that are found in the DLCs only work in their respective DLCs. They do not work if one switches back to Niko Bellic's storyline, or if you try and use Johnny's cheats, in Luis's storyline, or if you try and use Luis's cheats in Johnny's storyline. However, Niko's cheats work in Johnny's storyline and Luis's storyline.

Cleaned the Mean Streets*

486-555-0150(GUN-555-0150)

Cleaned the Mean Streets*

Cycles weather sequentially to the next condition (same order as the time.cyc file), there are eight different weather conditions

468-555-0100(HOT-555-0100)

None

Clear Wanted Level

267-555-0100(COP-555-0100)

Walk Free, One Man Army*

Add 1 Wanted Star

267-555-0150(COP-555-0150)

None

While outside, bring up the cell phone and insert the following phone numbers to spawn the vehicles listed. (inputting the numbers while inside saves the number if first inputted but does not spawn the vehicle.)

*Confirmed for Xbox 360 and PlayStation 3, restarting the system, and reloading the game will re-enable the achievements/trophies

Another cheat to get full health, armor, ammo and repair one's vehicle can be used if the player is driving the Mr. Tasty ice-cream truck; cycle through the ice cream jingles (using the horn button) until the GTA IVtheme plays, then call the ZiT Service (948-555-0100). Although not documented as such, this will block the achievement/trophy 'Finish Him.'

Note that outrunning cops who try to stop the player skipping islands when Niko is in a spawned Jetmax will NOT give the Walk Free achievement but can be obtained later on in the same save file after being wasted.

If the player has completed all 30 of Stevie's Car theft missions, Stevie will pay cash for almost any car delivered to his garage. Using vehicle-spawning cheats, the player can exploit this arrangement for as much money as he or she wants. Below are the prices of the (eligible) spawnable vehicles; keep in mind that this table is presuming that the car is just spawned and has not taken any damage.

When riding around in a cab, entering and using cheats do not block achievements for the Xbox 360.

Most cars have a low sale value, however driving gently into a wall (enough to scrape the paint) will dramatically improve the value of certain cars. For example, when the Cognoscenti is spawned and sold in perfect condition, Niko will get $8,000; scraping the car against the wall of the garage while entering will change the payout to the full retail value, $10,500 (some have reported the value further increasing to $10,800). Presumably this is a game bug, possibly the game lowering the base value of the cars for reselling, but uses the full price to decide the value when broken in the garage.

The Lost and Damned

The downloadable content adds cheats to spawn new vehicles. These do not block any achievements or trophies. In addition, any of the cheats from the main game can be used, and do not block any achievements in The Lost and Damned.

This list of phone numbers can be found at The Lost's clubhouse in Acter, in the form of a flier listing the vehicles either for sale or as a prize for a contest.